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TIL the fins on the Apollo rockets existed only to provide an additional moment of stable flight so a crew member could reach an abort handle. The fins did not provide stability during normal operational flight.

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xVXD5 TIL that Frank Sinatra's acceptance speech for a Legend Award at the 1994 Grammys was cut short due to commercial breaks. In response, Billy Joel stopped halfway through his performance of 'The River of Dreams' later on, simply looking at his watch and saying 'valuable advertising time going by...'
1j97 TIL that “Elephants are capable swimmers. They have been recorded swimming for up to six hours without touching the bottom, and have travelled as far as 48 km (30 mi) at a stretch and at speeds of up to 2.1 km/h (1 mph).”
OGQL6 TIL that Telex, a telecommunication service that provides text-based message exchange for teleprinter devices at receiving and sending locations, declined as fax machines grew in popularity in the 1980s.
E1v7X TIL that Stonehenge was restored in the 1950s and 60s, including re-erecting stones, setting some in concrete and lifting and straightening others
9pOM TIL Bighorn Sheep will kick each other in the balls as a challenge to another ram.